Planoflrapii co



l. B. NEESHAM.

MoLQlNG MACHINE Fon FouNnnY us5.

APPLICATION FILED MN. I8. l9l9.

Patented Oct. 7, 1919.

4 SHEETS-SHEET! Worf/ggfs:

THE IZOLUMBM PMNooRApll cn., WASHINGTON, D. c.

J. B. NEESHAM.

MOLDING MACHINE FOR FOUNDRY USE.

` APPLICATION FILED IAN.18| 1919. 1,318,101. Patented Oct. 7,1919.

4 SHEETS-SHEET 2.

l. B. NEESHAM.

MOLDING MACHINE FOR FOUNDRY USE.

APPLICATION FILED ml. la. |919.

1,318,101. 'Patented oet. 7,1919.

4 SHEETS-SHEET 3.

Fig. 5.

J. B. NEESHAM.

MOLDING MACHINE FOR FOUNDRY USE.

APPLICATION FILED 1AN.|8.19|9.

1 3 l 8, 1 O 1 Patented Oct'. 7, 1919.

4 SHEETS-SHEET 4.

WWE/Wyss 'rn sr ro-niv BIRCH NEESHAM, or GLASGOW, SCOTLAND.

nomme-MACHINE ron FOUNDRY USE.

Specfcationof Letters Patent.

Patented Oct. 7, 1919.

Application filed January 18, 1.919.` Serial No. 271,898.

sure and is allowed to fall by gravity the mold being formed about the pattern by jarring or jolting. p

Under this invention, the molding machine comprises a molding table and a turnover table, fluid pressure cylinders being connected with the tables, and valve means being provided for controlling the supply, of fluid under Vpressure to the cylinders,

whereby the raising and lowering of the tables and the jarring 'operatori areV performed.' The turn-overtable is manipulated by means of Aworm gearing.

There is also provided in connection with the valve controlling the jarring operation, a pilot valve and a by-pass,'the construction and arrangement being such that the action of the jarring valve is 5 controlled by the pilot valve so that the necessary volume of pressure fluid is admitted for jarringrpurposes, while the jarring valve can also be controlled or locked 'by the pressure fluid at the proper times, for example, when drawing a pattern, andits movement prevented in the event of thesupply of fluid to the pilot valve being inadvertently or accidentally turned on, which would, inordinary circumstances, cause the molding table to precipitately fall.

On the drawings z- Figure l is a side` View of the improved molding machine. Y

Fig. 2 is an end view thereof and showing,

' in dotted lines, the turn-over table D in the raised position.

Fig. 3 is a side view, partly in section, and Fig. 4 a plan view of the improved valve mechanism fitted to a molding machine such" as illustrated at Figs.` l and 2, and

F ig. 5 is a vertical section, to an enlarged scale, of the valve mechanism with the valve a removed.

In carrying out the invention, as illusf4 4tratechgs is the usual main lluidfpressurc cylinder containing the ram for raising and loweringthe molding table B. B1 are cushioning impact surfaces on which the molding table normally rests. C are fluid pres* sure cylinders containing the rams for raising and lowering the turn-over table D. E is the worm gearing for turning over the turn-over table D. ,F is the jarring valve mechanism for controlling the arring operation. G is the pilot valve mechanism. H is the by-pass, and I is the pipe connection thereto for the fluid under pressure. J is the pipe connection to the pilot valve mechanism G while K is the pipe connection to the main cylinder A` through the jarring valve chest b.

The pattern is secured to the turn-over table D andthe mold boX is secured over the.

pattern vand filled withsand as usual. The jarring operation is performed by raising the molding table B and turnover table D,

tothe desired extent, by means of the ramin the cylinder A. When the cylinder A is opened to exhaust, both `tables fall by gravity and thus produce the jarring action, which action is continued or repeated as long as is considered necessary-or desirable and is hereinafter fully described. f

When the jarring operation is completed the turn-over table D with the mold thereon is raised to its full extent by admittingfluid pressure to the cylinders C and it is then turned over or rotated by means of the worm gearing E operated by the hand-wheel B1. The molding table B is then raised byV admitting pressure fluid to the cylinder A,

until it touches `the molding boX dependinf y from the turn-over table D and the boX is then detached. The molding table B is then allowed to move downward with the mold thereon, either by leakage around the ram,

or by opening the usual exhaust valve, while the suspended pattern is still secured to the turn-over table D. The turn-over table D ation, the mold on the molding table B be' ing meanwhile removed by any suitable means.

A control rod a4 (seeFig. 2) is secured to theV lower surface of the molding table BV and it projects downward so that its lower end almost contacts with the bolt head .at the upper end of the pilot valverc (see Fig,

3). The function of this rod will be hereinafter explained.

rIhe mechanism for controlling and lock? ing the jarring valve by the pressure fluid, at the proper times, in the event of the supply of fluid being inadvertently or accidentally turned, on to the pilot valve, will now be described. i j

The jarring valve a (shown in Fig. 3 but omitted in Fig. 5) which is fitted in a suitable chest 79, is preferably ofcylindrical formation and comprises Aan upper and a lower part connected together by a neck c of smaller diameter, said neck forming a circumferential groove in the valve. The valve chest is provided with ports or openings, cl, e, c1, f, 5) the port or opening d communicating with the source of fluid pressure through the by-pass H, the ports or openings. c, e1, con'lmunicating with the main cylinder A, and the exhaust opening f with the atmosphere. Another port or opening m1 is provided and communicates with the pilot valve 7c. Y The jarring valve a is also provided, at its lower end, with a working face g which rests upon a suitable seat g1 lformed in the lower end of the valve chest A 7) so as to make a fluid-tight joint therewhich'passes through the valve chest cover.

Thev opening r in the valve chest cover admits lubricant to the interior for lubricating the valve a;

The valve chest 7) is provided with a flange c h to which is connected a flange c' of the pilot valve chest j.

The pilot valve 7c, Vfitted in the chest j, is preferably in the form of a spindle made hollow at its lower end'and coinniuni'catingl with the fluid pressure supply by means of the pipe J. rlhe pilot valve 7c is made, at its center, with a slot 701, running length.- wise'therein into which projects a screwed pin 762, operating througlrthe valve chest y' thereby limiting the upward and downward movements of the valve; The valve 7c is also made hollow at its lower end for the reception' of a hollow screwed faste-ningn by means of` which the cupvleather 0 is secured in place. Suitable ports or passageways m., m2, m3,. m4, are also formed in the valve 7e and valve chest j. The portl m in the valve 7c serves to, admit fluid pressure to. the;y interior of the jarring'valve chest 5 by means ofthe communication port m1 for operating or raising` the jarring valvel a, which admission takesfplace wl'ien the two ports are brought into line by the upward movement of the valve 7c. lVhen the valve a is raised the exhaust port el from the main cylinder A is opened and the pressure huid exhausts from the cylinder A thereby causing the molding table B to instantaneously fall and produce the jolt or jar. The circumferential passageway m3, formed in the valve 7c, provides a means of communication between the port m1 and the exhaust port m2 so as to allow the valvec to fall thereby putting the main cylinder into communication with the fluid pressure pipe by means of the port c. The passageway m4 serves for the admission of lubricant to the valve chest, by means of the pipe Connection p.

The upper end of the pilot valve 7c, which projects through the valve chest j, is pref erably provided with a cap or cover 7c3 which serves as a sand guard for preventing particles of sand, falling from the molding table, lodging on` the upper part of the chest j and interfering with the operation of the valve 7c.

The by-pass H is connected to the upper part of the jarring valve chesto by means of the opening d and, at its other end, to the huid pressure supply pipe I which; communicates with the lifting cylinders C, When the lifting cylinders C raise the turnover table D the pressure fluid also passes, by way of the bypass H and the opening c7 to the interior. of the upper part of the jarring valve chest o thereby creating a pressure therein and locking and jarring valve a on its-seat.

By locking the jarring valve on its seat in the manner described, saidV valve is prevented from opening to the exhaust while a mold is being lowered away from the pattern, and lifting and leakage is prevented, moreover, any accidental dropping of the main table, through theopening of the valve or cock admitting pressure fluid to the pilot valve 76, is also prevented, as dur-k ing` the operation of drawing the mold the pilotV valve remains out of action;

While I prefer to standardize the stroke of the jarring valve. c, that is to say, to'have a certain length of stroke in accordance with the size of the machine, I may in some cases, so constructv the valve 7o that the stroke can be varied. In order to do this I make the pilot valve 7e with an additional port m5 which port can be brought into line withthe communication port m1 by unscrewing the screw pin 7.92 from the-slot' 701 and partially rotating thel valve until the other slot 754 formed therein comes into line withv the point of the pin 7a2. When this takes place the pin 762 can beonce more` screwed into position` in the slot 7a4. As theslot 7c4 is shorter than the slot 761 the stroke of the valve `7c is limited accordingly while the port m5 will admit fluidv pressure tothe interior of the jarring valveichestb, by means ofthe coinmunication port mk i The sequence of operations is Yas follows:-V l :A i

Pressure fluid is first admitted to the pilot valve la by means `of the pipeJ thereby raising the valve 70 until it contacts with the lower end of the pilot valve control rod at. Pressure fluid is now admitted to the valve chest b by the pipe K to allow of same passing'by means of the port e to the under side of the piston in the main cylinder A thereby raising the molding table B-and the control rod at thus releasing the'pilot valve 7c which, having pressure fluid underneath it, resumes its'upward movement until the lower end of the slot Zal contacts with the screw pin 7a2 when it stops. In this position .the portonJ comes opposite theV port m1 thus admitting pressure fluid to the underside of the upper part of the jarringV valve a and forcing said valve upward against the lower end of the screw asinV the cover so as toopen the exhaust port-c1 in the valve chest ZJ' andpermit the pressure fluid to exhaust from the main cylinder Athereby causing the molding table `B to, at once, fall onY to the impact surfaces B1 and produce the j arf ring action.

Simultaneously with the fall of the table B the control rod at also moves downward and once more contacts with the upper end of the pilot valve la and forces same down thereby bringing the circumferential passageway 'm3 Vopposite the exhaust port m2 thus permitting the fluid pressure under the jarring valve a to escape by means of the port m1 and exhaust port m2V when the spring a2 immediately forces the jarring valve a down on its seat g1 bringing the various parts in to their original position again for repeating the jarring operation. 'I-he jarring` operation continues as long as thetpressure fluid supply is allowed to passto vthe pilot valve 7c by the pipe J and to the jarring valve t by the pipe K.

Zhen the jarring operation is vconcluded pressure fluid is lthen admitted'to'the liftingcylinders C bythe pipe I to raise the turn-over table D, from whence it also passes by way of the by-pass H andfopening (l into the valve `chest b thereby locking the jarring valve a during thel raising and reversing of the Vturn-over table D. Fluid is then admitted to the main cylinder A by" the pipe K to raise the molding table B to meet the turned over mold and, thereafter, the supply of iiuid to the main cylinder is discontinued and the usual exhaust cock, for exhausting fluid from below the Amain ram, by port e, is opened to allow the table and mold to gradually resume their normal position, or this is allowed to be eHected by leakage around the main ram. When the mold is cleared off the molding table B the turn-over table D is again reversed and the fluid exhausted from the side cylinder C which allows the turn-over table D also to fall to its normal position. When this takes placethe jarring valve a is relieved of the fluid pressure in the upper .part of the valve chest I) and the valve a is then again under normal working conditions.

I-Iaving now fully described my invention what I claim and desire to secure by Letters Patent, is

l. A molding machine of the jarring type and operated by fluid pressure provided with lifting cylinders and having means, in connection with the jarring valve, for controlling the operation of the sameby fluid pressure and means for locking the jarring valve by fluid pressure when desired, said means comprising a pipe leading from the lifting cylinders for conveying fluid pressure to the top of said jarring valve.

2. A molding machine of the jarring type and operated by fluid pressure provided with lifting cylinders 'and' having, in conibination with the jarring valve, a pilot valve operated by the fluid under pressure for controlling the action of the jarring valve, and a by-pass leading from the lifting cyl- 3. In a device of the character stated, a pilot valve casing having Van inlet at its bottom, a pilot valve in said casing having j a longitudinal groove in its body, a stop in said casing andL adapted to engage the top and bottom terminals of said groove, means for mechanically actuating said pilot valve in a downward direction by the descent of a molding table, a jarring valve casing, a jarring valve therein, said jarring valve casing being open at its bottom or exhaust, and exhaust ports in said casings controlled by a reduced portion cf said pilot valve.

i 4. In a device of the Character stated, lifting cylinders, a pilot valve casing having an inlet at its bottom, a pilot valve in said casing having a longitudinal groeve in its body, a stop in said casing and adapted to engage the top and bottom terminals of said groove, means for mechanically actuating'said pilot valve in downward direction by the descent of a molding table, a jarring valve casing, a jarring valve therein, said jarring valve cas ingbeing open at its bottom for exhaust, and exhaust ports in said casiiigs controlled by a reduced portion of said pilot valve, in combination with a by-pass leading from lifting cylinders for conveying fluid pressure to the top of said jarring valve to temporarily lock the latter.

5. In a device of the character stated, a pilot valve casing having an inlet at its bottom, va pilot valve in said casing having a longitudinal groove in its body, a stop in said casing and adapted to engage the top and bottom terminals of said groove,ineans for mechanically actuating said pilot valve in a downward direction by the descent of a molding table,.a jarring valve casing, a jarring'valve therein, said jarring valve casing being open at its bottom for exhaust, a spring intermediate the top oi' said jarring valve and the top of its casings, an adjustable threadedstem for limiting the upward movement of said jarring valve, and exhaust ports in said casings controlled by a reduced portion 'of said pilot valve.

6. In a device of the character stated, lifting cylinders, a pilot valve casing having an inlet at its bottom, a pilotvalve in said casing having a longitudinal groove in its body, a stop in said casing, and adapted to engage thetop and bottom terminals of'said groove; meansfor mechanically actuating said pilot valve in a downward direction by the descent of a molding table, a jarring valve casing, a arring valve therein, said jarring valve casingv being open at its bottom for eX- haust, a spring intermediate the top of said jarring valve and the top of its casing, an adjustable threaded stem 'for limiting the upward movement of said arring valve, and exhaust ports in said casings controlled by a reduced portion of said pilot valve, in combination with a by-pass leading from lifting cylinders for conveying fluid pressure to the top of said jarring valve to temporarily7 loclr the latter.

7. In a device of the character stated, a pilot valvey casing having an inlet at its bottom, a pilot valve in said casing and adapted to engage the top and bottom terminals of said groove, means for mechanically actuating said pilot valve ina downward direction by the descent of a molding table, a jarring valve casino', a jarring valve therein, said jarring valve casing being open at its bottom for exhaust, and exhaust ports in said casings controlled by a reduced portion of said pilot valve, in combination with a cup leather piston at one end of said pilot valve andi a striker head at the top of said pilot valve and adapted to be actuated by a control rod carried by said molding table.

8. A molding machine of the jarring type having a molding table, a turn-over table, fluid pressure means for raising the molding table, fluid pressure means for raising the Copies of this patent may be obtained for five cents each,cby addressing the Commissioner of Patents,

turn-over table, a jarring valve, means for controlling the operation of the jarring valve by uidpressure, and means whereby fluid pressure can be admitted to the jarring valve inorder to lockV the same and thereby prevent the molding table being'dropped by the action of said jarring valve while the turn-.over table is raised.

9. A molding machineof the jarring type having a molding table, a turn-over table, fluidv pressure means for raising the molding table, fluid pressure meansfor raising the turn-over table, a jarring valve, a pilot valve arranged in combination with said jarring valve and adapted tov admit fluid pressure for moving-the valve in one direction, resilient means for moving the valve in the opposite direction, and means whereby fluid pressure can be supplied to raise the turnover table and at the same time be admitted "to one end of they jarring valve to lock the same in position.

l0. A molding machine of the jarringtype having a molding table, liuid pressure means for raising the-table, a vvalve for controlling the' supply ofthe fluid pressure and forexhausting the same, a pilot valve lfor controlling the action of said control valve, said pilot valve being actuated by fluid pressure in one direction and by themolding table in the opposite direction, the combined valves 'controlling the movements of the molding table. A

11. In a deviceoi:I the character stated, a pilot valve casing having an inlet at its bottom, a pilot valve-in said casing having two.- longitudinal grooves in its body, the grooves being oi''diflerent lengths, a stop in said casing and adapted to engage thetop and bottom Vterminals of either of said grooves, means for mechanically actuating said pilot valve'in a downward direction by the descent of a molding table, a jarring valve casing, a jarring valve therein, said jarring valve casing being open at its bottom for exhaust, and exhaust ports in said casings controlled by a reduced portion of said pilot valve.

In testimony whereof l aliix my signature in presence of two witnesses.

JOHN BIRCH NEESHAM. Witnesses VILLr-AM FLEMING, KATE WALKER.

Washington, D. G. 

